Facing increasingly severe weather, utilities are improving grid reliability and resilience by undergrounding lateral lines. But this key grid-hardening strategy comes with its own set of challenges.
When a fault or loss of source affects an underground residential distribution circuit, it almost always results in a sustained outage. Often, the issue takes hours to repair and requires multiple truck rolls—leaving customers without power for an extended time.
S&C’s EdgeRestore Underground Distribution Restoration System is an automated switching solution that fits seamlessly into residential distribution transformers to restore power in seconds, boost customer reliability, and enhance crew operations.
Faster Restoration for Underground Faults
Watch how the EdgeRestore system isolates faults and restores power from an alternative source in less than 60 seconds through intelligent switching operations.
Advantages
Deploys Easily
Install quickly with no complicated set up, specialized tools, or configuration.
Boosts Reliability
By reducing sustained outages, customer reliability and satisfaction get a boost.
Improves Operations
Automated FLISR enhances crew efficiency and safety.
Dive into all the advantages of deploying this automated underground restoration solution.
Learn MoreScenarios
Watch how the EdgeRestore system automatically restores power to customers when various problems occur on an underground residential distribution circuit.
Construction
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Features
Automated switching
Bushing well interrupters and the EdgeRestore control enable fault detection, isolation, and switching for power restoration.
Manual loadbreak switching
Eliminates need for crews to pull energized elbows.
Visual status indicators
Semaphore colors on bushing well interrupters show open and close states, indicating the direction of the fault.
Transformer-compatible design
Fits into new or existing ANSI Type 1 and Type 2 transformers for easy installation.
Pre-configured controls
Does not require onsite software programming, settings management, or firmware updates for quick deployment.
Current sensing
Continuously monitors primary current, signaling the EdgeRestore control if a cable fault occurs.
Peer-to-peer communications
Uses power line carrier communication between EdgeRestore systems for automatic restoration and return to normal operations.
LED voltage indicators
LEDs on the EdgeRestore control signal to crews whether voltage is detected.
Cross-phase detection
Closing operation uses a phase-angle voltmeter before closing to avoid cross-phasing.
Stay in the Loop with 24/7 Monitoring
Add Ubicquia’s UbiGrid® Distribution Transformer Monitor (DTM+) sensing and communications package to the EdgeRestore system for 24/7 device monitoring, enhanced situational awareness, and improved fault responses.
Take a Closer LookNeed Support?
S&C is here to help you through any stage in your grid-modernization journey, from system studies to 24/7 support. Explore more below.
Product Details
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Table 1. EdgeRestore Underground Distribution Restoration System Control
| Control Type | Programming* |
|---|---|
| Normally closed (NC) | Two recloses, open transition |
| Normally open (NO) | Two recloses, open transition |
* Programming includes the number of recloses the control will operate after (two) and the return-to-normal transition (open).
Table 2. EdgeRestore Bushing Well Interrupters (50/60-Hz Ratings)
| Nom. Voltage | Maximum Voltage (Single Phase to Ground) | BIL Voltage, Line to Ground | Cont. Current | Short-Circuit, Sym. Current | Bushing Well Configuration |
|---|---|---|---|---|---|
| 15 and 25 kV | 15.2 kV | 125 kV | 80 amp | 6300 amp | H1A |
| 15 and 25 kV | 15.2 kV | 125 kV | 80 amp | 6300 amp | H1B |
